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A 12b 1kS/s 65uA 0.35um CMOS Algorithmic ADC for Sensor Interface in Ubiquitous Environments  

Lee, Myung-Hwan (Dept. of Electronic Engineering, Sogang University)
Kim, Yong-Woo (Semiconductor Division, Samsung Electronics)
Lee, Seung-Hoon (Dept. of Electronic Engineering, Sogang University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.45, no.3, 2008 , pp. 69-76 More about this Journal
Abstract
This work proposes a 12b 1kS/s 65uA 0.35um CMOS algorithmic ADC for sensor interface applications such as accelerometers and gyro sensors requiring high resolution, ultra-low power, and small size simultaneously. The proposed ADC is based on an algorithmic architecture with recycling techniques to optimize sampling rate, resolution, chip area, and power consumption. Two versions of ADCs are fabricated with a conventional open-loop sampling scheme and a closed-loop sampling scheme to investigate the effects of offset and 1/f noise during dynamic operation. Switched bias power-reduction techniques and bias circuit sharing reduce the power consumption of amplifiers in the SHA and MDAC. The current and voltage references are implemented on chip with optional of-chip voltage references for low-power SoC applications. The prototype ADC in a 0.35um 2P4M CMOS technology demonstrates a measured DNL and INL within 0.78LSB and 2.24LSB, and shows a maximum SNDR and SFDR of 60dB and 70dB in versionl, and 63dB and 75dB in version2 at 1kS/s. The versionl and version2 ADCs with an active die area of $0.78mm^2$ and $0.81mm^2$ consume 0.163mW and 0.176mW at 1kS/s and 2.5V, respectively.
Keywords
ADC; CMOS;
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